Which of the following is the binding site for RNA
polymerase on the DNA molecule?
a. structural gene 1
b. repressor gene
c. promoter sequence
d. operator sequence
e. region between an operator and the first
structural gene
Answer: c
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What factor is NOT involved in the movement of
water through a plant? a. transpiration pull b. the cohesion of water molecules c. hydrogen bonds d. the replacement of lost water molecules e. active transport
______ are produced by leukocytes and fibroblasts. It inhibits virus replication and cell division and increases the action of certain lymphocytes that kill other cells.
A) Cytokines B) Interferons C) Chemokines D) TNF
The scientific name for Neanderthals is
A) Homo sapiens. B) Homo habilis. C) Australopithecus robustus. D) Homo erectus. E) Homo neanderthalensis.
The key phagocytic cells of the body are the
A. eosinophils and macrophages. B. neutrophils and macrophages. C. macrophages and monocytes. D. natural killer cells. E. basophils and neutrophils.